Physics - NLM Question with Solution | TestHub

The arrangement shown in the diagram is moving with acceleration $\overrightarrow{\mathrm{a}}=4(\hat{\mathrm{i}}+\hat{\mathrm{j}})\mathrm{m}/{\mathrm{s}}^2$. An ideal spring of natural length ${\ell }_0$ having spring constant $\mathrm{K}=50\mathrm{N}/\mathrm{m}$ is connected to block A. Blocks A & B are connected by an ideal string passing through frictionless pulley. Mass of each block A & B is 2 kg. If the friction coefficient between all the surfaces is 5/9 then just after releasing from rest, (initially spring is in its natural length) :-